Occasionally I will be using my 2011 13" Air and the CPU will spike to 40-50% usage and then quickly go right back down. The only applications I have open is Google Chrome (flash blocked, turned off) and my activity monitor. It isn't too bad but it gets annoying because I'll just be browsing the web and all of a sudden I feel the computer heat up and so checking the computer temp the CPU will jump to 65-80C range and the fans kick on to 4000+RPM and then in about 30 seconds it calms back down. I have had my laptop for around 2 weeks now so I don't think it would be spotlight indexing by now. Here is a screenshot showing the running processes and the spike, I can't seem to catch a screenshot of the actual process running when it spikes so I'm not sure what it may be? Any suggestions? Also, below is a screen shot showing the CPU around only 1% yet the temp is rising rapidly to above 60C (peaked at 85C a few seconds after this then cooled back down) while the fans are around 5400rpms.